Fabric-tension governor for tire-making machines.



APPLIG'ATION FILED 111111.25, 191s.

Pand .131112, 1915.

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J. R. GAMMETER.

FABRIC TENSION GQYBRNOR PoR Tim; MAKING MACHINES. I APPLICATION FILED AUG. 25.11913. 1 l 24,4 1 2 J. R. GAMMEIER.

FABRIC TENSION GOVERNOR FOP. TIRE MAKING IIIAGIIINBS.

APPLICATION TILE!) AUG. 25, 1913.

Patented Jan.12,1915.

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I'rn f s'IArEs PATENT "oIiFIon .IoIgN n. GAMME'TER, OF AKRON, OHIO, AssIeNoR To aan B. F. oficionnrcn COMPANY;

or Nnwyonn, N. Y., A loonnoiaarrolvor NEW YORK.

FABRIC-TENSION GOVERNOR non TIRE-MAKING MACHINES.

Specification of Letters Patent.

Patented Jan.. 12, 1915.

Application filed August 25, 1913. Serial No. 786,460. I

To ZZ whom t may concern.'

Be it known that I, JOHN R. 'GAMMETEL a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented certain new and useful improvements in F abrio-Tension Govi ernors for Tire-MakingMachinesof which thefollowing is a specification.

This invention relates to machines for winding a strip of fabric on a core or man# drel, as, for example, winding the'canvas layers in the carcass of a pneumatic-tire of the peripheral resistance at the point of casing. lt is the practice in that art to'join a number oflengths of frictioned duck, cut on the bias, so as to make a strip of a. certain measured length adapted to inwrap the'core a' predetermined number of times. During the winding operation a strong tension is applied, whereby the middle ofthe strip is stretched to make it conform to the round core, and this tension must be maintained as nearly uniform as possible. It is naturally a difficult matter ,to make the original measured lengthof fabric, when stretched -by the machine, correspond exactly to the desired number of turns or layers, without either shortage or excess, and the prior practice has been to leave enough excess to make up for. any possible shortage. This occasions waste. because of the amount which often has to be cut off from the end of the strip at the completion of the winding operation. The principal object of my invention is t0 avoid such waste of fabric.

|The present invention is an improvement on the fabric-tension device shown in my pending application Serial No. 783,736,

filed August 8, 1913, which employed a friction wheel in contact with the periphery of the core or the layers of fabric thereon. said wheel controlling the speed of the fabric .let-oft' roll through a direct chain-andsprocket connection. This form of connection, while fully operative and successful in'practice, is 'open to the objection abovenoted, thatitsuse involves a waste of fabric due to the allowance required -for a possible shortage, the particular cause of uncertaintv i iny that instance being the slippage which occurs between the friction measuring wheel and the core or the wound fabric. g

In my present invention IV employ a brake which'furnishes the principal resistance to unwinds.

contact between the measuring roll and the core or Wound fabric, thus maintaining-said resistance small in amountandsubstantially constant?. A

Of the accompanying drawings, Figure'1` represents a side elevation of a preferred form of my fabric-tension governor applied .to a tire-making machine of which a portion.

of the core-support and a' core thereon are. shown. Fig. 2 represents an end elevation yof the fabric-feeding' mechanism viewed from the plane 2-2 of Fig. 1. Fig. 3 repre' s ents a plan view, partly' in section,7on the line 3 3 lof Fig. 1. Figsl and 5 represent Va horizontal section and a vertical. section of the rim of the measuring wheel. Fig. 6 represents a vertical section showing certain of the operating parts of the governor. Fig. 7 represents a section on the line 7.'-7 of ly in section, at the line 8--8 of Fig.v 6,

Fig.- 6. Fig. 8 representsan elevation, partshowing mainly the brake and adjacent members. l

In the drawings, 10 is a chuck mounted on a shaft 11, and carrying an annular tire core, mandrel or ring 12 of the usual form. Shaft V11 is positively driven by suitable mechanism (not shown) and causes the core 12 to exert a pull uponthe fabric.

13, 13.?are frame standards carryingr the fabric-feeding 'mechanism The strip of frictioned duck is placed in .the machine in the form of a roll 14, and the liner which separates the rubberized surfaces lin this roll is taken up Ona roll 15 as the fabric strip 'the outer fabric layer thereon, and is connectedwith the tension roll 21 'by a chainrotation of the fabric tension roll, and I control the pressure on said brake by means and-sprocket gearing, to be described, so that the two -rotate at equal angular velocities. The roll 21 however, is of smaller'diameter, and hence of shorter circumference than the wheel 22, and this predetermined From the roll 14, the strip 1'6 l 'fra-tio or dierence between their circumfer.- ences. represents the percentage of stretch imparted'to the middle of the fabric strip.

'lfhejvvheel 22 is mounted on a shaft 23, car-v ried by a pan" of arms 2li, which are loosely hung on frame bosses surrounding the shaft 2.0. YVheel 22 is yieldingly held against the core'by afspring 25, having a follower 26 connected with a fork 27 on a roch-shaft 28, which is attached to a hand-lever 29 having un auxiliary lever 30` and a lociring-pawl 31 v working over a toothed segment 32, Whereby the pressure of the measuring Wheel. on the core may be adjusted er entirely relieved. The spring pressure is transmitted through a-.nut and hand Wheel 33 mounted on ascrevvstem 34, whereby further adjustment of the sprmg pressure may be edected,

" and said stem connects with the shaftv 23 through a fork 35.

36,37- are sprockets of equal pitch-diam- 'i eterfastened to the shafts of the tension roll ,andr measuring Wheel, and'SS is a chain @which passes over these sprockets aud also over two idlesproclrets 39, which are jour- -naled on the arms of an inverted T-shaped, vdouble-platev roch-frame 40, -vvhereby the chain is .spread into a diamond-shaped iigi .to a brake-drum 42 on said shaft.. @ne end of said brake is anchored on a pin t2 pro- @acting from a bracket t, which is mounted ure Theframe is loosely hun?,` on shaft 2G of the tension roll 2l, and serves to control thepressure of a band-breite l1 applied on ione of the arms 2li, and the other end of said brake is connected by a link l5 with the short'arm of a bell-crank lever d6, pivotefl on another pin i7 ,on said bracket, The

longarm of the bell-crank lever is connectedby a'link 48 with a pin i9 on the rockfraine 40, and the arrangement is such. thatl Whenlsaid rock-frame swings te the right or tov/ard the tire-core as viewed in Fig. 1,

the brake pressure is'decreased, While the contrary motion increases said pressure.

The tread-ring of measuring-Wheel :'32

l is composed of -a suitable frictiopal material, such as compressed Wood pulp, and to further increase its gripping power. l prefer fto provide it With' a'nuniber of radial pointed pins 51, which normally project beyond the tread of the Wheel, but are backed by a soft-rubber ring 52 so that said pins may yield Whenthey come in contact letit, and since said roll is of smaller diameter than the Wheel and rotates turn arsenite for turn therewith, the fabric is correspondingly dzretched over the middle or larger diameter of the core.' The resistance to rotation of the roll 21, instead of .being entirely furnished by friction at the point A between the core or the Wrapped fabric v thereon and the measuring-Wheel, is furnished in large part by the brd-ke 41, for it is evident that the pull exerted by the roll 21 on the Wheel 22 through the right-hand side of the chain 38, as viewed in Fig. 1, v'vill produce a continuous leftward pressure in the frame 40, causing the brake to contract upon its drum. The component of this resistance, furnished by the Wheel 22 at the point A, is relatively small and insullicient to produce any slippage at that point. This component is automaticallymaintained substantially constant, for if the drag at point A (or in other Words, the torque-resistance of the measuring-Wheel) should tend to increase, this Would produce an increase of tension on the right-hand side and a decrease on the left-hand side of the chain 38 and cause the lbrake component of the total resistance to increase. lf on the other hand, the resistance at A should tend to decrease relatively to the brake pressure, this would cause a slackening of the right-hand side and a tightening of the left-hand side of l.the chain, and the brake pressure Would thereupon be relieved until the resistance at A resumes its normal amount. In practice the *movements of the frame ld are of small amplitude, and the resistance at A is effectively and delicately controlled so that an original-length of fabric, when stretched according to the ratio of diameters of the rollv 21 and Wheel 22, Will exactly correspond to a desired number of turns or Wrappings of the fabric on the core.

' l claim:

1. ln a fabric-tension device, the combination of a rotary fabric-pulling core, a rel.tard'ing roll adapted to engage the fabric, a

driving connection between said core and roll for causing the fabric to stretch by a Apredetermined amount in passing onto the core, and a brake for the roll Whose .pressure is controlled by said connection.

2. The combination, with the fabric-pull-l y ing core of a tire-making machine, of a roll adapted to exert a drag upon the strip of fabric fed to said core, a brake for said roll, and a measuring Wheel frictionally driven by the periphery of said core and the outer layer of fabric thereon, and governing the pressure of said brake.

3. ln .a tire-making machine, the conbination of -a rotary core, a fabric-tension roll having,r a brake, a measuring Wheel adapted to be frictionally driven from the periphery of said core, and having a peripheral speed greater, in a predetermined ratio, than that of the tension roll, and means responsive to i7ariati'ons in the torque-resistance 'of said measuring wheel for controlling the brake pressure.

- 4e. .In a tire-making machine, the combi'- vnationof a rotary core, a vcore-driven measuring wheel, a fabric-tension roll having a peripheral speed less than' that of said meas- A-.uring wheel, a brake for said roll, sprockets anda chain connecting said wheel and roll,l

and means'controlledby differences in tenj sion between the two sides of thel chain for Y controlling the. brake pressure.

5. In a tire-making machine, the combination of a rotary core, a core-driven meas- `u rmg wheel, a fabric-tension roll having a brake, a driving connection between said wheel and roll including a chain, and a chain-spreader sensitive to diEerences of tension between the two sides of' the chain sprocket on its shaft of the same diameter as the first-said sprocket, a brake for said drum,'

a chain connecting said sprockets, and a chain-spreader adapted to increase the brake pressure when the huil from the tension roll I to the measuring wheelincreases and4 Vice 7. 'In a tire-making machine, the colnb= nation of a rotary core, a fabric-tension roll having a sprocket and a brake-drum, a brake for `said drum7 a core-driven measuring Wheel having a sprocket, a chain passing around said sprockets, and a chain-spreading rock-frame mounted to turn about the axis of said tension roll and connected with the brake, said frame having idle sprockets engaged with the chain.

ln testimony whereof I have hereunto set my hand in the presence of two subscribing Y witnesses, this 21 day of August, 1913.

JOHN R. GAMMETER.

Witnesses:

W'ALTER K. MEANS, ILLA N. KIRN. 

